JP2811548B2 - Blade straightening device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade straightening apparatus, for example, for bending and twisting of a turbine blade or other blades manufactured in a forging process.
Alternatively, the present invention relates to a blade straightening device capable of correcting three-dimensional distortion such as opening / constriction distortion.

[0002]

2. Description of the Related Art Conventional blades include a turbine blade for power generation utilizing the power of steam and gas, and an engine blade for a jet engine.
In such a blade, various distortions may occur in a manufacturing process (for example, a forging process). The forging process of forgings such as blades includes a stamping process for forging a material such as a round bar into a predetermined shape by a die forging press, a heat treatment process such as quenching and annealing, and a straightening process to correct the shape by pressing operation. There are a process, a correction process of correcting the shape by cutting, a surface treatment process, and a process of processing a mounting portion such as thread cutting.

[0003] In the stamping process or the heat treatment process, there are generally three types of distortion generated in a forged product such as a turbine blade, such as a bending distortion, a torsional distortion, and an opening / constriction distortion of a profile portion. Actually, these distortions are related to each other to generate distortion. The removal of various types of distortion generated in this way is called "correction".

[0004] In the conventional straightening device, although the above-mentioned three types of distortion are generated in relation to each other with respect to a blade such as a forged product, generally, one type is used for each type of distortion using a dedicated device. Corrections were being made in order.

[0005] The three forms of the bending distortion, the torsional distortion, the opening / constriction of the profile portion, and the method of correcting the three types will be outlined with reference to FIGS. 5 to 16, taking the forged turbine blade 1 as an example. FIG. 5 is an explanatory view showing a plane, a front, and a right side of the turbine blade 1, respectively. FIG. 6 is an end view taken along the line VI-VI of FIG. 5, wherein the turbine blade 1 has a blade root (base) 2; A blade surface (blade portion) 3 extending over a predetermined length from the blade root 2 and exhibiting a predetermined three-dimensional shape. FIG.
Shows a profile portion 3A which is a cross section orthogonal to the longitudinal direction of the wing surface portion 3.

FIG. 7 is a front view showing bending distortion.
The bending strain deviates from the original shape (regular correct shape) indicated by the dotted line, and deviates in the longitudinal direction of the turbine blade 1 (or its blade surface portion 3) in a direction perpendicular to the longitudinal central axis 1A of the turbine blade 1. This is the distortion that occurs in

FIG. 8 is an end view showing the torsional strain. The torsional strain is deviated from the original shape shown by the dotted line, and the profile portion 3A rotates around the longitudinal central axis 1A of the turbine blade 1. This is a distortion that is generated by shifting.

FIG. 9 is an end view showing an open distortion of the profile portion 3A, and FIG. 10 is an end view showing a narrow distortion of the profile portion 3A. These open distortion and narrow distortion are the original shapes shown by dotted lines. To one end 3B of the wing surface 3
And the other end 3C is rotated around the longitudinal axis of the wing surface portion 3 in opposite directions to each other, so that the profile portion 3A opens or contracts.

FIG. 11 shows a straightening device 4 for bending distortion (FIG. 7).
FIG. 3 is a front view of the device, and the bending distortion correcting device 4 includes a device table 5, a base pad 6, a blade pad 7, and a hydraulic press 8 having a hydraulic cylinder.

In order to correct the bending distortion using such a bending distortion correcting device 4, first, a base base 6 and a blade base 7 are mounted on the apparatus table 5 at necessary intervals, and the base base is supported. The turbine blade 1 is placed on the gold 6 and the blade portion pad 7. Since the press point of the hydraulic press 8 is a fixed point, the wing surface 3 to be corrected is
Fine adjustment is made to match the position with the press point. Next, pressure is corrected using a hydraulic cylinder to perform correction.

FIG. 12 is an explanatory view showing an end surface taken along the line XII-XII and an end surface taken along the line XIII-XIII of FIG. 11. Since the torsion angle as the turbine blade 1 differs depending on the cross section of the blade surface portion 3, bending distortion is reduced. The direction of pressurization by the hydraulic press 8 at the time of straightening also differs depending on each part. In such a case, the base pad 6 or the blade pad 7 having a different angle with respect to the hydraulic press 8 is required. FIG. 13 shows a case where the pressing direction is to be changed.
It is a side view which shows the base part backing metal 6 or the blade part backing metal 7 from which an angle differs.

FIG. 14 is a front view of the device 9 for correcting torsion distortion (FIG. 8).
0, a pair of pads 11 for holding the blade root 2 of the turbine blade 1, and a C-type hydraulic press 1 having a hydraulic cylinder.
2 and a torsion correction jig 13 (FIG. 15). In order to correct the torsional distortion, a pair of fins 11 is mounted on the apparatus table 10, the blade root 2 is mounted on the pair of fins 11, and the turbine blade 1 is clamped by pressing with a hydraulic cylinder.

[0015] As shown in FIG.
At the position where the blade surface 3 of the turbine blade 1 is to be corrected, and using the fulcrum end 13A as a fulcrum and the application point end 13B as an application point, the pulling force of a human or an overhead crane (not shown) can be used to correct torsional distortion. Correction is performed by giving to the tool 13.

FIG. 16 shows the opening / constriction distortion (FIGS. 9 and 10).
FIG. 2 is a front view of the straightening device 14 of FIG. 1, wherein the straightening device 14 for opening / constriction distortion includes a device table 15, a concave metal plate 16,
A hydraulic press 17 provided with a hydraulic cylinder.

In correcting the opening / constriction distortion by using the opening / contraction distortion correction device 14, the hydraulic press 1 is used in the same manner as the bending distortion correction device 4 shown in FIG.
Correction is carried out by the pressurizing action of 7. However, the wing surface 3 located at the center of the concave portion of the concave metal plate 16 is pressurized to perform correction.

The conventional straightening devices 4, 9, 14 as described above
Has the following problems. That is, in the distortion removal work, distortion that is different from the distortion that existed before removal often occurs. In general, distortion removal is performed by repeating the removal and inspection while converging the amount of distortion to a predetermined shape. Has been created.

In particular, since the turbine blade 1 has a three-dimensional shape in which the original shape itself exhibits a bent shape and a twisted shape, a bending distortion due to a reaction force from the turbine blade 1 accompanying a pressing operation during a straightening operation. Not only does the straightening device 4 or the torsional strain correcting device 9 partially move, but also there is a problem that a strain in a form different from the strain that is performing the straightening during the straightening operation occurs. For example, when the bending distortion is corrected, a torsional distortion occurs.

Therefore, the correcting operation of the turbine blade 1 not only repeats the removal and inspection of the distortion form alone, but also removes and inspects the three forms (bending distortion, torsional distortion, opening / constriction of the profile portion 3A). It becomes necessary to repeat.

Thus, the above-described various distortion correcting devices 4, 9,
14 has the following problems. First, bending distortion, torsional distortion, opening of the profile part 3A
Various funds 6, 7, 11, 1 for correcting stenosis
It is necessary to perform the straightening operation while exchanging the used jig such as the jig 13 and the torsion distortion correcting jig 13. Therefore, each time a repetitive operation using the straightening devices 4, 9, 14 in order is performed, the work of attaching the pads 6, 7, 11, 16 and the torsion correcting jig 13 to the straightening devices 4, 9, 14 is further performed. There is a problem that the work efficiency is poor because the carrying work between the devices is repeated.

Second, when the hydraulic press 8 for correcting bending distortion is used, the press point of the hydraulic press 8 is set in a state where the turbine blade 1 is mounted on the base base 6 and the blade base 7 loaded on the apparatus table 5. However, the base cover 6 and the blade cover 7 and the turbine blade 1 are both metal surfaces and are slippery.
There is a problem that the turbine blade 1 may fall from the base metal cover 6 or the blade metal cover 7, which may be dangerous.

Further, when the hydraulic press 8 shown in FIG. 11 is used, the turbine blade 1 is brought into contact with the base support 6 or the blade support 7 loaded on the apparatus table 5, and the base support 6 and the blade support 7 are contacted. When the pressure is applied with the fulcrum as a fulcrum and the distortion is removed, the apparatus table 5, the base metal pad 6, the blade metal pad 7, and the turbine blade 1 all come into contact with the metal surface, so that they are slippery, and the pressure increases. Base contact 6 or blade contact 7
However, there is a problem in that there is a danger that the blade may fly off the turbine blade 1.

When the hydraulic press 8 is used, since the pressing direction is constant, if it is desired to change the pressing direction, replace the base pressing metal 6 or the blade supporting metal 7 suitable for the angle. It is necessary to change the mounting angle of the turbine blade 1. Therefore, a large number of base bases 6 and blade bases 7 are required, which increases the jig cost and repeats the exchange of jigs, resulting in poor work efficiency.

The torsional distortion correcting device 9 shown in FIGS. 14 and 15
In this case, there is a problem that the operation of the torsion correcting jig 13 for correcting the torsional distortion is manually performed, and the correcting ability is low.

Further, in the case where it is not possible to cope with the torsion distortion correcting operation by human power, the crane is pressurized by using the lifting force of the crane. However, such operation deviates from the original use method of lifting the crane. There is a problem that it is dangerous because of the danger, and the work efficiency is poor due to the long setup time.

Furthermore, since the above-mentioned various correcting operations are difficult to perform quantitatively and rely on intuition from the experience of the operator, the operation requires skill and it is difficult to perform an accurate correcting operation. And the quality of the correction is greatly affected by personal ability.

In short, there are various problems such as that the correction work may involve some danger, that the work efficiency is extremely low as compared with other processes, and that this is a major factor in cost increase.

These problems are caused not only when the blade is manufactured by the forging process as described above, but also when casting,
This also occurs in the case of manufacturing by machine cutting or other manufacturing processes. In addition, as the size of the blade increases, the correction process becomes indispensable.

[0028]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has various forms of distortion such as bending distortion and torsion distortion of a blade such as a turbine blade, and opening / constriction of a profile portion. It is an object of the present invention to provide a blade straightening device which can perform a straightening operation with only one device and only once by attaching the device to the device without using a conventional pad.

Another object of the present invention is to provide a blade straightening device capable of safely, reliably and promptly removing distortion such as bending distortion, torsional distortion, and opening and narrowing of a profile portion.

Further, the present invention provides a blade straightening device which can perform a straightening operation, which is indispensable in a manufacturing process such as a forging process, from a conventional straightening operation relying on experience and intuition, and a human straightening operation. The task is to provide.

[0031]

That is, the present invention is to fix a base portion such as a turbine blade or an engine blade and pressurize a straightening portion from an upside down direction, and to freely move a press point of a pressurizing mechanism. It holds the base of the blade manufactured in the forging process and other manufacturing steps, is rotatable in the normal direction and reverse direction around the longitudinal direction of the blade as an axis, and at any angle. A fixable blade fixing mechanism, and a predetermined portion of the blade held in a predetermined posture by the blade fixing mechanism can be pressurized from the first direction side and the second direction side, respectively, , A first pressurizing mechanism and a second pressurizing mechanism that can move independently of each other, And a blade correction device characterized in that it comprises a display mechanism for displaying the second moving distance and pressure load of pressure direction pressing mechanism.

The blade fixing mechanism includes a circular index rotatable 360 degrees or more in a normal rotation direction and a reverse rotation direction, a base clamp provided at a tip end of the circular index and clamping a base of the blade, and a circular index. A rotation stopping mechanism capable of holding the rotation position at an arbitrary angle.

The first pressing mechanism can be used as a lower pressing mechanism, and the second pressing mechanism can be used as an upper pressing mechanism.

The lower pressurizing mechanism is provided below the blade fixing mechanism, and is capable of moving and fixing the blade in the front-rear direction orthogonal to the longitudinal direction, and a lower bed with respect to the lower bed. And a lower cylinder capable of moving and fixing the blade in the longitudinal direction and a lower pressure ram thereof.

The upper pressurizing mechanism comprises an upper bed provided above the blade fixing mechanism, an upper cylinder movable and fixable to the longitudinal direction of the blade with respect to the upper bed, and an upper pressurizing ram thereof. Can be provided.

[0036]

In the blade straightening apparatus according to the present invention, a predetermined portion such as a blade surface can be pressurized while a base of the blade such as a blade root of a turbine blade is fixed.
Blade bending distortion, twist distortion, opening of the profile
It is possible to correct the distortion such as swelling with a single device having the same correction function as a conventional bending distortion correction device, torsional distortion correction device, and opening / constriction distortion correction device.

Further, the first pressing mechanism (lower pressing mechanism) and the second pressing mechanism (upper pressing mechanism), which can be independently moved to arbitrary positions of the blade, apply pressure from opposite directions. Since the pressure work is performed, it is not necessary to position each of the fins according to the type of strain and the pressing direction each time using various buckles as in the past, and to avoid the danger of flying. Therefore, it is safe and work efficiency can be improved.

Further, since the moving distance and the pressing load of the first pressing mechanism and the second pressing mechanism in the pressing direction are displayed by the display mechanism, the predetermined portion of the blade is determined based on the display contents. Can be stably deformed, the quality can be reliably stabilized without relying on the experience and intuition of the worker, and the worker can be released from the conventional heavy-handed work.

[0039]

Next, a blade straightening apparatus 20 according to an embodiment of the present invention will be described with reference to FIGS. However,
The same parts as those in FIGS. 5 to 16 are denoted by the same reference numerals, and detailed description thereof will be omitted. FIG. 1 shows a blade straightening device 20.
FIG. 2 is a front view of the blade straightening device 20. The blade straightening device 20 includes a device table 21, a vertical frame 22 standing upright on the device table 21, a horizontal frame 23 provided horizontally on the vertical frame 22, and a blade fixing mechanism. 24, a lower pressurizing mechanism 25 (first pressurizing mechanism) provided below the blade fixing mechanism 24 (first pressurizing mechanism), and an upper pressurizing mechanism 25 (second pressurizing side) above the blade fixing mechanism 24. It has an upper pressing mechanism 26 (second pressing mechanism) provided and a display mechanism 27 provided on the vertical frame 22.

FIG. 2 is a rear view of the horizontal frame 23,
FIG. 3 is a plan view of the device table 21 and FIG. 4 is a right side view of the blade fixing mechanism 24. The blade fixing mechanism 24, as shown in FIGS. 1, 3 and 4,
Circular index 2 provided on vertical frame 22
8, a blade root clamp 29 provided at the tip of the circular index 28, and a rotation stopping mechanism 30.

The circular index 28 is rotatable by 360 degrees or more in the normal rotation direction and the reverse rotation direction with respect to the vertical frame 22. The blade root clamp 29 clamps the blade root 2 of the turbine blade 1 to The turbine blade 1 can be freely rotated around the longitudinal direction about the axis. Further, the circular index 28 is provided to the operator in the device table 2.
1 (horizontal direction orthogonal to the longitudinal direction of the turbine blade 1).

The rotation stopping mechanism 30 is capable of holding the rotation position by the circular index 28 at an arbitrary angle.
5 and the pressurizing operation by the upper pressurizing mechanism 26 is performed.

As shown in FIGS. 1 and 3, the lower pressing mechanism 25 includes a lower bed 31 movable and fixed in the front-rear direction with respect to the apparatus table 21, and a lower bed 31.
A lower cylinder 32 and a lower pressurizing ram 33 that can move and fix in the left-right direction (longitudinal direction of the turbine blade 1).

As shown in FIGS. 1 and 2, an upper pressing mechanism 26 includes an upper bed 34 fixed to the back surface of the horizontal frame 23, and an upper cylinder movable and fixed to the left and right with respect to the upper bed 34. 35 and its upper pressure ram 36.

As a driving source for the blade fixing mechanism 24, the lower pressing mechanism 25, and the upper pressing mechanism 26, any one such as a hydraulic mechanism or an electric mechanism can be adopted.

As shown in FIG. 1, the display mechanism 27 has a cylinder moving amount display plate 37 which indicates the moving distance of the lower pressing ram 33 and the upper pressing ram 36 in the pressing direction.
, And a pressure gauge 38 that indicates each pressurized load.

The blade straightening device 2 having such a configuration
0, the blade root 2 of the turbine blade 1 is attached to the blade fixing mechanism 24 at an arbitrary angle (posture) and fixed, and one blade fixing mechanism 24 and a four-way moving mechanism (the blade fixing mechanism 24) are fixed. Front and rear direction, lower pressure ram 3
3 and the upper and lower pressing ram 3
6 (left-right direction), a press point in an arbitrary pressing direction can be set at an arbitrary position of the turbine blade 1.

Further, the lower pressurizing ram 33 and the upper pressurizing ram 36 can hold the pressure independently of each other. Can be arbitrarily selected and the fulcrum and the action point or the force point for the correction can be arbitrarily selected and determined.

Further, the moving distance of the lower pressing ram 33 and the upper pressing ram 36 in the pressing direction and the load thereof can be displayed by the cylinder moving amount display plate 37 and the pressure gauge 38 of the display mechanism 27, respectively. Therefore, the pressure correcting operation can be stably performed according to these display contents.

Next, the operation for correcting the bending distortion of the blade surface portion 3 of the turbine blade 1 will be specifically described. First, the blade root 2 of the turbine blade 1 is attached to a blade root clamp 29, the circular index 28 is rotated by a predetermined angle and set to a desired angle, and then fixed at that angular position by a rotation stopping mechanism 30.

However, it is assumed that how much the blade surface 3 of the turbine blade 1 is distorted from its normal shape and is distorted is measured in advance or in a state where the blade surface is set in the blade fixing mechanism 24. As this measuring means, any means can be adopted regardless of non-contact or contact,
For example, a gauge (not shown) that can trace the surface shape of the regular wing surface portion 3 can be used.

Either the lower pressurizing ram 33 of the lower pressurizing mechanism 25 or the upper pressurizing ram 36 of the upper pressurizing mechanism 26 is connected to the center of the longitudinal direction of the wing surface portion 3 other than the section desired to be corrected. The fulcrum of the blade surface portion 3 is secured at this portion by abutting the turbine blade 1 on the portion of the longitudinal center axis 1A).

The other of the lower pressurizing ram 33 or the upper pressurizing ram 36 used as the fulcrum is brought into contact with the longitudinal axis of the wing surface portion 3 having a cross section desired to be corrected, so that the action of the wing surface portion 3 is achieved. Secure points (power points).

Cylinder movement amount display plate 3 of display mechanism 27
Set the value of 7 to zero. The lower pressurizing ram 33 or the upper pressurizing ram 36 serving as the fulcrum is fixed, and the pressure gauge 3 indicating the numerical value of the cylinder moving amount display plate 37 and the pressurizing load.
Pressing the upper pressurizing ram 36 or lower pressurizing ram 33 as an action point while watching the numerical value of 8, the pressure is released when the display reaches a preset numerical value, and one cycle of correction is completed. I do. Such a correcting operation is repeatedly performed on a desired cross section.

It should be noted that the correction of the torsional distortion, the opening distortion of the profile portion and the bulge distortion is the same as the correction of the bending distortion described above. In the case of torsional strain, the lower pressure ram 33
The positional relationship between the upper pressurizing ram 36 and the upper pressurizing ram 36 is set to be point-symmetric with respect to the longitudinal center axis 1A of the turbine blade 1. That is, the lower pressurizing ram 33 and the upper pressurizing ram 33 such that both ends (one end 3B and the other end 3C) of the profile portion 3A rotate in the same rotation direction around the longitudinal center axis 1A. By driving the ram 36, pressure is applied to obtain the original shape.

In the case of the opening distortion or the bulging distortion of the profile portion, the positional relationship between the lower pressurizing ram 33 and the upper pressurizing ram 36 is adjusted in a plane orthogonal to the longitudinal central axis 1A of the turbine blade 1. Set to be symmetric. That is, both ends (one end 3B and the other end 3B) of the profile portion 3A around the longitudinal center axis 1A.
C) so that the lower pressure ram 33 rotates in the opposite rotation direction.
By driving the upper pressure ram 36, pressure is applied to obtain the original shape.

Thus, the blade fixing mechanism 24, the lower pressing mechanism 25 and the upper pressing mechanism 26 are moved to a position where the blade surface 3 can be corrected, and the lower pressing ram 33 and the upper pressing ram 36 are moved to the blade surface. In step 3, correction is performed by applying pressure to one or both of the lower pressing ram 33 and the upper pressing ram 36 while checking the numerical value of the display mechanism 27.

In the above-described embodiment, the lower pressurizing ram 33 and the upper pressurizing ram 36 serve as press points.
Are provided one by one, but these numbers can be arbitrarily selected according to the type of strain or the pressing operation.

Further, the output of the moving distance in the display mechanism 37 is not limited to the output in the pressing direction, and the moving distance of the other movable portion may be output and displayed.

The blade straightening apparatus according to the present invention is used for the work in the straightening step, and is used when the straightening is necessary also in other steps such as the above-mentioned correction step, surface treatment step or processing step. Can be.

The present invention is effective for straightening in the manufacturing process of turbine blades and engine blades, but is also applicable to any other members such as propellers having three-dimensional shapes, crankshafts, and structural members of ships. be able to.

[0062]

As described above, according to the present invention, the blade fixing mechanism, the first pressing mechanism (lower pressing mechanism), and the second
The pressing mechanism (upper pressing mechanism) or the like eliminates the need for a pad as in the case of the conventional straightening device, and the fulcrum and the operating point ( Since the pressing point is secured and pressurized, there is no danger such as flying of a contact metal, and the correction work can be performed safely and reliably.

The correction amount can be quantitatively grasped by outputting the movement amount and the load in the pressing direction by the first pressing mechanism and the second pressing mechanism to the display mechanism.
Stable quality correction can be performed without relatively skill.

Further, instead of using a separate straightening device for each bending strain, torsional strain, or opening / shrinkage strain, the straightening can be performed by one unit, and the time required for setup and transport for the straightening operation can be reduced. It is possible to remarkably improve the work efficiency.

[0065]

[Brief description of the drawings]

FIG. 1 shows a blade straightening apparatus 20 according to an embodiment of the present invention.
FIG.

FIG. 2 is a rear view of the same horizontal frame 23;

FIG. 3 is a plan view of the same device table 21;

FIG. 4 is a right side view of the blade fixing mechanism 24;

FIG. 5 is an explanatory view showing a plane, a front, and a right side of a conventional general turbine blade 1;

6 is an end view taken along the line VI-VI of FIG. 5 and shows a profile section 3 which is a cross section orthogonal to the longitudinal direction of the wing surface section 3. FIG.
A is shown.

FIG. 7 is a front view showing bending distortion.

FIG. 8 is an end view showing torsional strain.

FIG. 9 is an end view showing the opening distortion of the profile portion 3A.

FIG. 10 is an end view showing squeezing distortion of the profile portion 3A.

11 is a front view of the bending distortion correcting device (FIG. 7). FIG.

12 is a sectional view taken along the line XII-XII of FIG.
It is explanatory drawing which shows the III-XIII line end surface.

FIG. 13 is a side view showing the base metal pad 6 or the blade metal pad 7 having a different angle when it is desired to change the pressing direction.

FIG. 14 is a front view of the torsion distortion correcting device 9 (FIG. 8).

FIG. 14. Twist in the straightening device 9 shown in FIG.
It is explanatory drawing of the distortion correction jig.

FIG. 16 Same, opening / constriction correction (FIGS. 9 and 10)
FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Turbine blade (blade) 1A Longitudinal central axis of turbine blade 1 2 Blade root (base) 3 Blade surface (blade portion) 3A Profile portion which is a cross section of a surface orthogonal to the longitudinal direction of blade surface portion 3B Blade surface 3 One end 3C The other end of the wing surface portion 4 4 A device for correcting a bending distortion 5 A device table 6 A base plate 7 A blade portion 8 A hydraulic press 9 A device for correcting torsional distortion 10 A device table 11 A pair of plates 12 C Hydraulic press 13 Torsion correction jig 13A End of fulcrum of torsion correction jig 13B End of application point of torsion correction jig 13 14 Opening / constriction correction device 15 Device table 16 Concave pad 17 Hydraulic pressure Press 20 Blade straightening device 21 Device table 22 Vertical frame 23 Horizontal frame 24 Blade fixing mechanism 25 Lower pressure mechanism (first Pressure mechanism) 26 upper pressure mechanism (second pressure mechanism) 27 display mechanism 28 circular index 29 blade root clamp (base clamp) 30 rotation stop mechanism 31 lower bed 32 lower cylinder 33 lower pressure ram 34 upper Bed 35 Upper cylinder 36 Upper pressurizing ram 37 Cylinder movement indicator 38 Pressure gauge

Claims (5)

(57) [Claims] 1. A blade fixing mechanism which holds a base portion of a blade, is rotatable in a normal direction and a reverse direction around the longitudinal direction of the blade, and can be fixed at an arbitrary angle. A predetermined portion of the blade held in a predetermined posture by a mechanism can be pressurized from the first direction side and the second direction side thereof, and can be independently moved to an arbitrary position of the blade. A first pressing mechanism and a second pressing mechanism; and a display mechanism for displaying a moving distance and a pressing load of the first pressing mechanism and the second pressing mechanism in the pressing direction. Characteristic blade straightening device. 2. The blade fixing mechanism includes: a circular index rotatable 360 degrees or more in a normal rotation direction and a reverse rotation direction; a base clamp provided at a distal end of the circular index and clamping a base of the blade; The blade straightening device according to claim 1, further comprising: a rotation stopping mechanism capable of holding a rotation position by the index at an arbitrary angle. 3. The apparatus according to claim 1, wherein the first pressing mechanism is a lower pressing mechanism, and the second pressing mechanism is an upper pressing mechanism. A blade straightening device according to any of the preceding claims. 4. The lower bed, which is provided below the blade fixing mechanism and is movable and fixed in the front-rear direction orthogonal to the longitudinal direction of the blade, 4. The blade straightening device according to claim 3, further comprising: a lower cylinder capable of moving and fixing the blade in the longitudinal direction with respect to the lower cylinder and a lower pressing ram thereof. 5. The upper pressure mechanism comprises: an upper bed provided above the blade fixing mechanism; an upper cylinder movable and fixable to the upper bed in the longitudinal direction of the blade; The blade straightening device according to claim 3, further comprising: a ram.